3A99166G05 LVDT Excitation & Signal Conditioning Board_Ningde Androld Automation Equipment Co.,Ltd.

June 05, 2026

3A99166G05 LVDT Excitation & Signal Conditioning Board

3A99166G05 is the finalized upgraded LVDT signal conditioning Eurocard for Ovation DEH turbine governing system, perfectly matched with full-series 3A99165 servo amplifier modules (3A99165G50/G51 etc.) and 3A99164 main control card for thermal & nuclear power unit valve closed-loop control.

Description

Part No.:3A99166G05｜Emerson (Westinghouse Legacy) Ovation DEH Turbine Control Module, Latest upgraded revision of 3A99166G series (G0/G03/G05), direct drop-in replacement for all former G revision cards

1. Product Overview

This module supplies standardized AC excitation to field-mounted LVDT displacement transducers on turbine stop valves, control valves and bypass valves; acquires weak millivolt AC position feedback signals from LVDTs, then implements rectification, multi-stage filtering and precision amplification, finally outputs calibrated ±10VDC analog position signal as setpoint input for downstream servo boards to realize precise valve stroke closed-loop regulation. It follows standard single-width Ovation rack dimension, fully pin-compatible with G0/G03 without cabinet wiring modification.

2. Core Electrical Specifications

Backplane power supply: +5VDC, ±12VDC powered by Ovation 3A99132 rack power supply module
Excitation output: 3kHz,7VAC stable sine-wave for independent multi-channel LVDT loops; G05 optimizes internal oscillator circuit for ultra-low fluctuation under unstable cabinet auxiliary power
Onboard protection: independent channel fuse, TVS lightning surge suppression, multi-order RC anti-jamming filter, improved overcurrent & short-circuit latch protection (optimized fault lockout logic vs G0/G03 editions)
Standard output: precision-calibrated ±10VDC full-scale DC analog signal, consistent input specification for all 3A99165 servo series cards

3. Environmental & Mechanical Parameters

Operating ambient temperature inside control cabinet: -15℃ ~ +72℃; storage temperature: -40℃ ~ +90℃
Full PCB conformal coating: upgraded three-layer anti-moisture, anti-mold, anti-salt-spray coating to adapt high-humidity, dusty power plant cabinet environment
EMC certification: fully compliant with IEC61000 industrial EMC standard; enhanced internal EMI suppression circuit to eliminate interference from site contactors and variable-frequency drives
Form factor: standard single-slot Ovation plug-in board, compatible with universal DEH system rack slots

4. Front Panel & Installation Features

Front panel LED indicators for board power status and per-channel failure alarm; reserved test terminals for field multimeter measurement of excitation AC voltage and conditioned DC output during commissioning and routine maintenance
Supports hot-swap replacement under rack standby condition; critical turbine control loops generally deploy redundant dual-card configuration to maximize system operational safety; G05 completely fixes original zero drift and signal jitter defects existed on early G0/G03 batches

5. Spare Part & Field Troubleshooting Guide

Original OEM formal production has been discontinued; available stock includes brand-new surplus original stock and fully bench-tested refurbished modules with standard 12-month factory warranty.

No LVDT excitation output: blown channel onboard fuse or abnormal backplane input power voltage
Continuous signal wandering & fluctuation: loose field LVDT wiring terminals or aging filter components
DC output zero offset drift: oxidized PCB gold finger contacts or degraded preamplifier chips (rare failure on optimized G05 version)

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